Lubricating oil



Patented Aug. 9, 1938 UNITED, STATES PATENT OFFICE LUBIHCA'IING OIL LeoLiberthson, New York. N. 1., accignor to L. Sonncborn Sons Inc, acorporation of Delaware No, Drawing.

40laims.

amounts of ',paraiiinlc constituents will corrode metal or alloysurfaces with which it comes in contact under temperature and pressureconditions obtaining in practice, and in many cases to such an extent,that the .metal will, after a period of time, be deteriorated to a pointwhere it must be replaced. The relatively short life of the metalrenders its use expensive, and its replacement in many casesinconvenient.

I have discovered that the addition of from 0.05. to 0.5% of tinmahogany sulphonate will give to such Pennsylvania paraflin baselubricating oil anti-corrosive properties, and that metal or alloysurfaces coming in contact with such blended oil will not be corroded tothe extent that has heretofore been experienced.

The tin mahogany sulphonate may be obtained by treating a lubricatingoil fraction, for example,

a fraction derived from a naphthenic base crude with sulphuric acid.preferably oleum. Such treatment yields an acid sludge, which containswater soluble green sulphonic acids, and an oil layer which contains oilsoluble, mahogany sulphonic acids. The oil layer is separated from theacid sludge and treated with alkali, such as sodium or potassiumhydroxide, whereupon sodium or potassium mahogany sulphonate is iormed.The mahogany sulphonate can be extreated from such oil bytrcatmentwithan organic solvent, such as an aqueous alcoholic solution. Upondistillation of the alcoholic solution, the alkali metal mahoganysulphonate is recovered. The alkali metal mahogany sulphonate isdispersed in water at an elevated temperature, for example, at about 100C., a soluble tin salt. is i added, and the tin mahogany sulphonate isprecipitated. f

The lubricating oil to which the said sulphonate is added, is onederived from a Pennsylvania Application March 3, 1936, Serial No. 66,822

paraflin base crude, for example, a straight distillate containingvarying amounts of paraiilnic constituents or may consist predominantlyof the same. It is common practice to blend straight distillates withsmall amounts of bottoms, for 5 example, an S. A. E. 20 commercial gradeof straight distillate and 10% bottoms.

The addition of from 0.05 to 0.5% of tin mahogany sulphonate' to alubricating oil derived I from a Pennsylvania paraflin base crude andcon- 10 taining varying amounts of paramnic constituentsyields an oilwhich will not cause the cor-' rosion normally associated with an oilnot so treated, and metal or alloy surfaces which come in contact withmy novel lubricant will experi- 15 ence a much longer life.

The above description is 301' purposes of illustration and not ofllxnitatlom'and is not to be limited except by the appended claims inwhich I have endeavored to claim all inherent novelty. 20

I claim: 7

Y 1. A ncn-corroding lubricating oil composition consisting 01' alubricating oil containing paraiilnic constituents. and from 0.05 to0.5% of a tin ma hogany sulphonate, said lubricating oil being 25derived from a Pennsylvania paramn base crude.

2. A non-corroding lubricating oil composition consisting of alubricating oil distillate containing paramnic constituents, and from0.05 to 0.5%

of a tin mahogany sulphonate, said lubricating 30.

oil distillate being derived from a Pennsylvania paraiiin base crude. VI

3. A non-corroding lubricating oil composition consisting predominantlyof a lubricating oil distillate containing paraillnic constituents, and35 from 0.05 to 0.5% of a tin mahogany sulphonate, said lubricating oildistillate being derived from a Pennsylvania paraflln base crude.

4. A non-corroding lubricating oil compositio consisting of alubricating oil derived from a Pennsylvania paraflln base crude,paraiilnic matter, and from 0.05 to 0.5% of a tin mahogany sulphon'ate.

LEO LIBERTHSON.

